body {
  background-color:#f5f5f5;
}
*{
  margin: 0;
  padding: 0;
}
a {
  text-decoration: none
}
ul{
  list-style: none;
}
.tip{
  font-size: 14px;
  color: #999;
  margin-top: 5px;
}
//清除浮动
.clearfix:after {
  /*最简方式*/
  content: '';
  display: block;
  clear: both;
}

.clearfix {
  /*兼容 IE*/
  zoom: 1;
}
